Excavating mechanism



2 SheetS-Sheet l Aug. 7, 1928.

L. R. RUSSELL.

EXCAVATING MEcHANIsM l Filed May 25. 1925 2 Sheets-Sheet 2 /NVEN Tof?. L011/5 R. .QL/55a L.

A TTONE Y lil Patented Aug. 7, 1928. y

UNITED STATES PATENT OFFICE.

LOUIS B. RUSSELL, 0F MARIONQOHIO, `ASSIGNOR T0 THEMARION STEAM SHOVELCOM'FANY, 0F MARION, OHIO, A CORPORATION OF OHIO.

y nxoAvA'riive Application led May 25,

This ,invention relates to excavating mechanism and more particularly toa boom designed for use with excavating mechanism in tunnels or otherlocations Where the over head clearance is limited. y f

Excavating machinery of this character ordinarily employs a straightboom and the excavating dipper is supported on that boom w between itsends. In order that the dippei"` may be elevated to the top of thetunnel, that is, to a height substantially evenwith the point of theboom, it is necessary to use a clipper handle of sufficient length toenable the clipper to be projected beyond. the point of the boom andwhen such a long clipper handle is used it is apt to be thrust into theoverhead structure or against parts of the mechanism `upon the return ofthe dipper to its initial position. i y n ne object of the invent'on isto provide an excavating mechanism comprising a'boom so shaped that theclipper or other exoavat ing device may be elevated to substantially theheight of the point of theboom by the use of a relatively short handle.y y

A further object of 'he invention isto` provide a mechanism. ofthischaracter with means for limiting the movement of the dipper toward theboom. y

A further object of the invention is to provide aboom of this character`which will be simple in its construction, of a strong durable characterand whichcan be manufactored at a relatively low cost. y

Other objects of the invention will appear as 'the device is describedindetail.

ln the accompanying drawings Fig. l is a side elevationfpartly brokenaway, of a port-ion of an .excavating mechanism em-` bodying myinvention; Fig. 2 is a side elevation of the boom, partlybroken away;Fig.

fi is a plan view of the connection between the clipper handle4 and `thedipper, showing" the hoorn in sectionrlfig. l is a detail view of thecasting at the outer end of the dipper handle; and Fig. 5 is a plan Viewof the pointof the buoni and the sheaves carried thereby. y y H l lnthese drawings Ihave illustrated one embodiment of my invention and haveshown the same in connection with a power shovel, the features ofconstruction of which MECHANISM.

1925. Serial No. 32,637.

are we ll known. As` here shown, the shovel comprises a basel supportedby suitable `tiaction devices 2 and having mounted thereon a revolvingplatform which carries the power plant and excavating mechanism. Mountedat one end of the revolving plat form is a boom t which is preferablypivN otally mounted on the platform and extends forwardly and upwardlytherefrom. The boom may be supported at the desired height in anysuitable manner7 as by means of cables Vt). Supported from the boom,between the ends thereof, is an excavating clipper 6 which is carried bya handle 7. The boom preferably follows the standard construction inwhich the boom comprises two parallel meinbers rigidly Vconnectedone tothe other but spaced apart for a portion of their length to provide anopening or slot through which the "clipper handle extends. The clipperhandleis provided on its lower edge with rack teeth 8 which mesh with apinion 9 carried by a shaft 10 journaled in suitable bearings on the twomembers of the boom and connected by means of a train of gears il with amotor, such as the electric motor 'l2 here shown. The operation of thepinion 9 by the motor imparts lengthwise movement to the clipper handleto move the clipper toward and from the boom and to crowd the clipperinto the bank. Upwardinovement is imparted to the dipperby means of acable 13 which,` in the arrangement here shown. is fined. at one end toa lug la carried by the dipper and extends about one of two sheaves 'l5at the point of the boom, then about a sheave 16 connected with theclipper and then about a second sheave l5 at thepoint of the boom andrearwardly to a drum l? on the platform 3i Ordinarily the boom l is substantially straight, that is, it entends in a straight line, but inorder-to secure the desired elevation of the clipper with a shortclipper handle l have arranged the front and rear portions 18 and 19,respectively` of the boom in intersecting lines, with the front portionextending upwardly from the line `of 'the rear portion. In the presentconstrucythe curvature of which is such as to support the front portion18 at the desired angle to the length of the rear portion 19. `The boomcomprises an integral structure, the several portions thereofbeing'rigidly connected one Vto the other, or fabricated. The dipperhandle 8 is mounted on the boom. at a point near the adjacent ends ofthefront and rear portions thereof and, in the present instance, the pinion9 is arranged close to the forward end of the rear portion 19 of theboom, thus enabling the handle and the dipper to be swung rearwardly orforwardly into the several positions shown in Fig. 1,l about a'relatively short radius. It will be noted that the dipper may befmovedt'oa position in front of but substantially7 at the same height as thepoint of the boom, which ordinarily extends close to the overheadstructure of vthe tunnel in which the'machine is working,-

and when in this position itprojects but a short distance from the pointof connection e of Y,the handle with the boom, thus enabling la Veryshort handle to be employed. Conj ple length to enable the dipper to bemoved sheave extends.

'21`are connectedone to the other by `a botto all necessary positions,as shown in fIfig. l. If desired, means may be provided to limit themovement of the dipper toward the` boom and, in the present device, thecastings 21, by means of which the 'dipper handle yis connected withlthe dipper, are provided with Y shoulders, here shown as flanges 22, onthe opposite sides thereof and arranged to engage the adjacent edges ofthe two Vboom vmembers and thus provide a positive stop for thedipperand to limit the rearward movement of the dipperha-ndle. These shouldersare so arranged as vto provide a substantially flat contact between thesame and the respective boom members'lin all positions of the dipperwith relation to the boom. In order that the dipper may be drawn closeto the 50, point of the boom the sheave 16 is arranged close to the rearwall or yback of the dipper ,and ishere shown as mounted between bearinglugs 23 carried :by thek dipper back, and the lcastings 21 of thehandleare spaced 'apart to provid'ea recess or slot 24 into which theThe two parts or castings to'm plate or casting 25, which` is alsocontions lmay nectedto the dipper. I

lVhile I have s own and described kone lembodiment of'my invention Iwish it to be `understood that I do not desire tobe limited tothedetails thereof as various modificaoccur to a person skilled in the art.

`t1o`n, and means for mounting` a dipper handle on said boom with itsfulcrum point above the rear portion thereof and near the adjacent endsofthe two portions thereof.

2. A boom having an intermediate portion curved about a horizontal axisand arranged to support the forward portion of the boom at an angle tothe rear portion thereof, and

, means for mounting a dipper handle on said boom with its fulcrum pointadjacent to the vupper edge of the rear portion thereof and close tosaid curved portion thereof.

3. In a structure of the character described, a boom comprising frontand rear portions having their adjacent ends rigidly connected one tothe other and so arranged that the front portion will extend upwardly atan angle to the rear portion, a pinion supported by said boom on an axisabove the rear portion thereof and near the adjacent ends of said frontand rear portions, a dipper handle having teeth to engage said pinion,and a dipper carried by said handle.

t. In a structure of the character described, a boom -comprising frontand rear portions having their adjacent ends rigidly connected one tothe other and so arranged that the front portion will extend upwardly atan angle to the rear portion, a dipper handle, means for pivotallymounting said dipper handle on said boom with its fulcrum point abovethe rear portion thereof and near the adjacent ends of the two portionsthereof, a dipper carried by said handle, and a stop carried by saiddipper handle to engage the adjacent edge of said boom and limit therearward movement of said dipper handle vwith relation to said boom.

5. In a structure of the character described, a boom comprising frontand rear portions having their adjacent ends rigidly |connected one tothe other and so arranged that said front portion will extend upwardlyatan angle to said rear portion, a dipper handle mounted on said boomnear the adj acent ends of the two portions thereof for swingingmovement, a casting carried by the forward end of said dipper handle andhaving a recess in the forward portion thereof, and lugs carried by saiddipper adjacent to said casting, a sheave mounted between said lugs andextending into the recess in said lcasting, 'a sheave mounted at thepoint of said boom, 'and a cable to connect the sheave ofsaid dipperwith the sheave of said boom.

6. In a structure of the character described, a boom comprising frontand rear lll) portions having their adjacent ends rigidly of said dipperarm, and a clipper secured to connected one to the other and so arrangedsaid casting, said casting having a portion 10 that said front portionwill extend upwardly arranged at the side of said dipper arm and at anangle from said rear portion, a flipper constituting a shoulder toengage the adja handle mounted on said boom near the ad cent edge ofsaid boom.

jacent ends of said portions thereof for both In testimony whereof, IaliX my signature swinging movement and longitudinal movehereto.

ment, a casting secured to the forward end LOUIS R." RUSSELL.

